Merge pull request #12824 from ankush/db_statica_hack

chore: static analysis hack for globals

frappe/__init__.py

@@ -15,6 +15,7 @@ from __future__ import unicode_literals, print_function
 from six import iteritems, binary_type, text_type, string_types, PY2
 from werkzeug.local import Local, release_local
 import os, sys, importlib, inspect, json
+import typing
 from past.builtins import cmp
 import click
 
@@ -134,6 +135,14 @@ message_log = local("message_log")
 
 lang = local("lang")
 
+# This if block is never executed when running the code. It is only used for
+# telling static code analyzer where to find dynamically defined attributes.
+if typing.TYPE_CHECKING:
+	from frappe.database.mariadb.database import MariaDBDatabase
+	from frappe.database.postgres.database import PostgresDatabase
+	db: typing.Union[MariaDBDatabase, PostgresDatabase]
+# end: static analysis hack
+
 def init(site, sites_path=None, new_site=False):
 	"""Initialize frappe for the current site. Reset thread locals `frappe.local`"""
 	if getattr(local, "initialised", None):